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Diffstat (limited to 'arch/arm/mach-spear/headsmp.S')
| -rw-r--r-- | arch/arm/mach-spear/headsmp.S | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/mach-spear/headsmp.S b/arch/arm/mach-spear/headsmp.S new file mode 100644 index 000000000..96f89436c --- /dev/null +++ b/arch/arm/mach-spear/headsmp.S @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * arch/arm/mach-spear13XX/headsmp.S + * + * Picked from realview + * Copyright (c) 2012 ST Microelectronics Limited + * Shiraz Hashim <shiraz.linux.kernel@gmail.com> + */ + +#include <linux/linkage.h> +#include <linux/init.h> + + __INIT + +/* + * spear13xx specific entry point for secondary CPUs. This provides + * a "holding pen" into which all secondary cores are held until we're + * ready for them to initialise. + */ +ENTRY(spear13xx_secondary_startup) + mrc p15, 0, r0, c0, c0, 5 + and r0, r0, #15 + adr r4, 1f + ldmia r4, {r5, r6} + sub r4, r4, r5 + add r6, r6, r4 +pen: ldr r7, [r6] + cmp r7, r0 + bne pen + + /* re-enable coherency */ + mrc p15, 0, r0, c1, c0, 1 + orr r0, r0, #(1 << 6) | (1 << 0) + mcr p15, 0, r0, c1, c0, 1 + /* + * we've been released from the holding pen: secondary_stack + * should now contain the SVC stack for this core + */ + b secondary_startup + + .align +1: .long . + .long spear_pen_release +ENDPROC(spear13xx_secondary_startup) |